Published : 2023-09-20 Comparison of the efficiency and durability of DULCOTEST probes PHEK 112 SE 303 B. - Categories : Questions about RedOX probes Hello. Is your probe as effective as the Preminante DULCOTEST PHEK 112 SE 303 B? Yes, I manufactured both. Do you know how many years they can last? Do you have any photos? 82% exceed three years. It looks exactly like the photo on the website.